Cutting head for dry shaver



Aug. 18, 1964 A. BEISMA CUTTING HEAD FOR DRY SHAVER Filed Nov. 23, 1962FIG.5

INVENTOR LOUW' A. BE! SMA United States Patent 3,144,714 CUTTING HEADFOR DRY SHAVER Louw Arjen Beisma, Drachten, Netherlands, assignor toNorth American Philips Company, Inc, New York,

N.Y., a corporation of Delaware Filed Nov. '23, 1962, Ser. No. 233,665Claims priority, application Netherlands Dec. 4, 1961 6 Claims. ((31.3043.92)

The invention relates to a cutting head for a shaving apparatus havingtransverse driving, in which one of the cutting plates provided withteeth on both longitudinal sides is fixed by means of a U-shaped braceconnected therewith, the limbs of which are connected on both sides tothe housing of the motor, while the movable cutting plate is providedwith notches on both ends which embrace limbs of the brace.

Such devices are known, in which, however, the brace with itssubstantially square cross-section is sunk in a central longitudinalslot of the fixed blade. This known construction has the drawback thatit results in a rather complicated form of the blades and acomparatively thick cutting head.

In addition it is known to construct the fixed cutting plate as such inthe form of a brace, as a result of which, however, also a rather heavyand expensive construction is obtained, since difliculties areencountered in fulfilling the various requirements, for the cuttingfunction, the fastening and the guiding of the movable blade.

The object of the invention is to provide a cutting head for shavingapparatus which can be manufactured in mass production withcomparatively low costs and which can be made available in a lightconstruction, while rigid requirements as regards durability andreliability are satisfied.

The invention is characterized in that the body of the connection braceconnected to the fixed cutting plate is formed by a metal plate providedbetween the fixed and the movable cutting plates and extendingthroughout the greater part of the width thereof, the longitudinal edgesof which plate constituting guides for the movable cutting plate.

The connecting brace consisting of sheet metal lies entirely enclosed inthis manner which is in favor of the appearance but in addition the bodyof this part which may be given a light construction also directly formsthe guide for the movable blade, while in this form it is suitable forobtaining further simplifications and improvements, for which purpose afavourable embodiment is characterized in that each limb of theconnecting brace is formed from two resilient pieces of plate extendingsubstantially in parallel with each other, the inner of which piecesforming a lug which is embraced by the corresponding notch of the finaledge of the moving blade and the outer of which forms a connecting ingwhich is provided with a spring catch with the motor housing.

So in this case the function of the limbs of the brace is distributedfor each brace over the two lugs of which the limb consists, while usingthe spring action thereof, as a result of which a cutting head isobtained which can rigidly be connected and which has easily removablecutting plates.

According to one embodiment the whole connection may easily beconstructed while enclosed and this embodiment is characterized in thatthe connection lugs fall within recesses inside the side walls of themotor housing and co-operate with parts of the spring catch providedtherein.

A further embodiment is characterized in that the inner lugs of eachbrace limb laterally support in a clamping manner fixed surfaces ofengagement provided in the motor housing.

3,144,714 Patented Aug. 18, 1964 Whereas according to the knownconstructions vibration of the fixed cutting plate is prevented, forexample by a heavy construction of the brace, according to the latterembodiment of the invention the same end is obtained but with a lightbrace consisting of sheet metal in a simple manner in that theresistance against vibration supplied by the outer connection lugs iscompleted by the said engagement of the inner lugs. Herewith it becomespossible to easily remove the set of cutting plates and yet obtain asuflicient safeguarding against vibration of the fixed cutting platewith the driving.

In addition to the inner lugs the function can be given in a simplemanner of taking along the moving cutting plate when removing the fixedcutting plate, because the inner lugs and in a laterally widened headwhich overlaps the edges of the notches provided in the short sides ofthe movable cutting plates.

When removing the cutting head the movable blade with the outer fixedblade is taken along because the first blade remains attached to thesaid lugs.

In order that the invention may readily be carried into effect, oneembodiment thereof will now be described more fully, by way of example,with reference to the diagrammatic drawing, in which:

FIG. 1 is a perspective view of the dismantled component parts;

FIG. 2 is a longitudinal cross-sectional view taken on the line 11-11 inFIGURE 1 of the mantled cutting head with part of the motor housing;

FIGURE 3 is the same cross-section as FIGURE 2 shows the cutting head inan oblique position, a limb of the brace being slid in the housing, andFIG. 3a shows a detail in side elevation;

FIGURE 4 is a cross-section taken on the line IV-IV in FIGURE 1 of themantled cutting head;

FIGURE 5 is a plan view of the motor housing.

FIG. 6 is a cross sectional 'view of the present device with the partsthereof in their assembled condition.

In FIGURES 1 and 4 the component parts are shown in an upside downposition with respect to the position shown in FIGURES 2 and 3.

- cated by 5 and are of a double construction, is manufactured of thinresilient sheet metal. This is punched in a manner such thatlongitudinal strips 6 remain which, as shown in FIGURE 4, guide the edgeof teeth 2 of the movable blade 1. In addition, cut-in longitudinalslots 7 are visible on the short sides of this blade.

The first pair of legs of the frame 3 which form the actual connectionwith the motor housing are designated by 8. A driving cone 9 is fixed inthe movable blade 1 and the head of the driving journal driven by themotor shaft in a vibrating motion is indicated by 11 in FIG- URES 2 and3.

The fixed cutting plate 4 is provided with two flanged eyelets 12 (seeFIGURES 1 and 4), of which in FIG- URES 2 and 3 only the center linesare indicated, which are passed through apertures 13 (FIGURE 1) oneither side of the body of the frame 3 and with which this frame isrigidly connected to the plate 4.

By means of material which is punched out of the central part of thebody of the connection frame 3 and is bent at right angles to the planethereof, the second pair of legs 14 are formed which extend in parallelwith the connection legs 8 of the limbs 5. At the end, the legs arewidened on either side, so that a widened head 15 is formed which legsembrace the edges of the slots 7 of the movable blade 1 (FIGURES 1 and4), as a result of which this is detachably and slidably connected tothe frame 3.

However, the legs 14 also form an additional support against vibrationin a longitudinal direction of the fixed cutting plate 4 with themovable cutting plate 1, because these resilient legs engage with somepressure transverse ribs 17 provided in the motor housing 16.

In addition, the movable cutting plate 1 after removing the cutitng headmay be removed by sliding the cutting plate to the left or to the rightthrough such a distance that the end edge of the slot 7 abuts against aleg 14. At the one end the cutting plate may then be lifted and guidedbeyond the widened head 15 of the leg located on that side possibly byforcing it slightly to the exterior in a resilient manner. In order toprevent that when fixing the cutting head to the motor housingwhen bythe fixing movement itself the blade 1 has to be brought from such anextreme position into a position in which both legs provide guidancetheblade during its movement to the center would abut with its free endagainst a leg 14 and consequently could not be brought further into itswork position the slots 7, are provided with bevelled corners asindicated by 18.

In addition, as shown in FIGURE 3, the cone 9 is constructed with awidening such that the driving pin 11 during fixing the cutting head inan oblique position and with the movable blade 7 in the position slidmost laterally, all the same engages already therein and, on furtherpressing the cutting head, is automatically guided into the centralaperture 19.

A spring catch of the shaving head in the motor housing is obtained bymeans of the outer legs 8 of the limbs because in the housing 16 (seealso FIGURES 3a and 5) on either side a pair of abutment stops 20 areprovided which project at right angles to the principal surface of thecorresponding leg 8. Each leg 8 ends in a rib 21 projecting on eitherside beyond the central portion of the leg which rib is obtained bybending that end of the leg concave. It may be seen from FIGURE 3 thatif the one end of the cutting head is guided into the orifice of themotor housing 16 and is forced against the side thereof, the rib 21 onthat side lies below the most projecting point of the abutment stop 20and the edge of the concave rib 21 on the other side already fallswithin the orifice edge of the housing. If that side is further forceddownwards in the direction of the arrow Q, in which the legs 8 may passinwardly in a resilient manner, the ends of each rib 21 projecting oneither side beyond the central portion of the leg 8 snap beyond the mostprojecting points of each pair of abutment stops 20. This is facilitatedby the inclined surface of the abutment stops 20, while the inclinedlower surface, under the action of the resilient legs 8, holds theshaving head downwards in the position in which the corners of the fixedcutting plate 4 engage the abutment stops 22 of the motor housing.

In addition it may be seen from FIGURE 3 that the legs 14 will also bepassed along and in a resilient manner against the side of the ribs 17because the upper edge thereof is rounded.

It appears from FIGURE 2 that the shaving head may also be inserted andremoved again without objection in an upright position in the directionof the arrow R.

What is claimed is:

1. A cutting head for a dry shaver having a reciprocating driving meanscomprising a housing, a fixed cutting plate, a movable cutting plateprovided with cutting teeth and notches at opposite ends thereof, asubstantially U-shaped frame having a first pair of legs thereofremovably connected to said housing, a second pair of legs on said frameinsertable in the notches of said cutting plate, said frame beingrigidly connected to said fixed cutting plate, the body of said framebeing located between said fixed and movable cutting plates, and thelongitudinal edges of said fixed plate constituting guides for saidmovable cutting plate.

2. A cutting head for a dry shaver having a reciprocating driving meanscompirsing a housing, a fixed cutting plate, a movable cutting plateprovided with cutting teeth and notches at opposite ends thereof, asubstantially U-shaped frame having a first pair of legs thereofremovably connected to said housing, a second pair of legs on said frameinsertable in the notches of said cutting plate, said frame beingrigidly connected to said fixed cutting plate, the body of said framebeing located between said fixed and movable cutting plates, thelongitudinal edges of said fixed plate constituting guides for saidmovable cutting plate, each of said pairs of legs being resilient,struck-up parts of said frame extending substantially parallel to eachother.

3. A cutting head for a dry shaver as claimed in claim 2 furthercomprising recesses and abutment stops in said frame, said outer pair oflegs on said U-shaped frame resiliently engaging the abutment stops insaid recesses in the housing.

4. A cutting head for a dry shaver as claimed in claim 1 wherein saidsecond pair of legs are each provided with an enlarged head portionwhich overlaps the notches of said cutting plate.

5. A cutting head for a dry shaver having a reciprocating driving meanscomprising a housing, a fixed cutting plate, a movable cutting plateprovided with cutting teeth, and notches at opposite ends therof, asubstantially U-shaped frame having a first pair of legs thereofremovably connected to said housing, a second pair of legs on said frameinsertable in the notches of said cutting plate, said frame beingrigidly connected to said fixed cutting plate, the body of said framebeing located between said fixed and movable cutting plates, and thelongitudinal edges of said fixed plate constituting guides for saidmovable cutting plate, said frame having recesses therein and abutmentstops in said recesses, said first pair of legs each having a rib at thefree end thereof projecting inwardly, said ribs being inserted firstinto said recesses and resiliently engaged with said abutment stops whensaid cutting head is placed in said housing.

6. A cutting head for a dry shaver as claimed in claim 1 wherein saidframe is a metal plate which extends over the greater part of the widthof said fixed cutting plate.

References Cited in the file of this patent UNITED STATES PATENTS2,107,207 Muros Feb. 1, 1938 2,530,759 Collins et al Nov. 21, 19502,859,513 Bylund Nov. 11, 1958 2,930,119 Kleinman Mar. 29, 1960 UNITEDSTATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No.: 3,144,714August 18, 1964 Louw Arjen Biesma It is hereby certified that errorappears in the above numbered patent' reqiiring correction and that thesaid Letters Patent should read as corrected below.

In the grant, line 1, and in the heading to the printed specification,line 3, for "Louw Arjen Beisma", each occurrence, read Leuw Arjen Biesmaon the sheet of drawing, line 1, for L A, BEISMA" read L. A. BIESMA onthe lower right hand corner of the drawing for "LOUW A. BEISMA read LOUWA. BIESMA Signed and sealed this 12th day of January 1965a (SEAL)Attest:

ERNEST" W; SWIDER Attestin'g Officer EDWARD J. BRENNER Commissioner ofPatents

1. A CUTTING HEAD FOR A DRY SHAVER HAVING A RECIPROCATING DRIVING MEANSCOMPRISING A HOUSING, A FIXED CUTTING PLATE, A MOVABLE CUTTING PLATEPROVIDED WITH CUTTING TEETH AND NOTCHES AT OPPOSITE ENDS THEREOF, ASUBSTANTIALLY U-SHAPED FRAME HAVING A FIRST PAIR OF LEGS THEREOFREMOVABLY CONNECTED TO SAID HOUSING, A SECOND PAIR OF LEGS ON SAID FRAMEINSERTABLE IN THE NOTCHES OF SAID CUTTING PLATE, SAID FRAME BEINGRIGIDLY CONNECTED TO SAID FIXED CUTTING PLATE, THE BODY OF SAID FRAMEBEING LOCATED BETWEEN SAID FIXED AND MOVABLE CUTTING PLATES, AND THELONGITUDINAL EDGES OF SAID FIXED PLATE CONSTITUTING GUIDES FOR SAIDMOVABLE CUTTING PLATE.